[Boost-users] [mpl - function_types] Generate typedef from operator() of a functor

Hi all, Given an mpl sequence of types such as: typedef mpl::vector arg_types; 1) the users of my library provide functors such as F (where T0 and T1 may have been any of the types of arg_types: class F { typedef mpl::pair signature_type; double operator()(const T0& t0, T1& t1); }; is there a way to generate signature_type automatically ? 2) if the operator() is overloaded, the user class currently has to typedef an mpl::vector of mpl::pairs such as class G { typedef mpl::vector, mpl::pair, mpl::pair > signature_type; double operator()(const T2& t2, T3& t3); double operator()(const T1& t1, T1& t1); double operator()(const T3& t3, T1& t1); }; in this case, is it also possible to generate signature_type automatically ? Regrads, Olivier